JPH0783499B2 - Simultaneous broadcasting high-definition television encoding system and system - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a simultaneous broadcasting system (simu).
lcast) high-definition television (hereinafter referred to as "HDTV") encoding system and method, in which high-quality video signals and high-quality audio signals are band-compressed by a subband coding technique. Uses HDTV band compression, adaptive modulation, scrambling, DSB-QM (double sideband-quadrature modulation), data under technology, etc. using three-dimensional sub-band coding in the simultaneous broadcasting system HDTV which is transmitted to the current NTSC transmission channel. HDTV signal to the current VHF channel or UHF
The present invention relates to an encoding system and method for transmitting on a channel.

A study on a simultaneous broadcasting system for band-compressing a high-quality video signal and a high-quality audio signal in HDTV by a sub-band coding technique and transmitting the band-compressed signal to a current NTSC transmission channel has been conducted by M. of USA.
IT Tech has been in full swing since 1983.

The method proposed by MIT is based on the existing NTS.
Although it is not compatible with C-type TV receivers, the existing VHF or UHF channel can be used as the transmission channel, so there is no need to install or add a separate transmission system or relay facility. is recieving.

Such simultaneous broadcasting system is contraindicated (taboo)
In order to eliminate interference caused by transmission between channels, that is, between adjacent channels, it is necessary to transmit high-quality image information in the 6 MHz band of a channel that is not used between channels, so the technique of band compression is important. is there.

Then, the transmission signal level must be reduced in order to suppress interference between adjacent channels,
In order to accomplish this, a direct current (hereinafter referred to as “DC”) component is extracted and digitally transmitted separately, or a modulation method is performed by using a carrier suppression method DSB-QM. A method for minimizing is being investigated.

Also, scrambling is performed to reduce channel noise and ghosts, so that noises and ghosts shown as crowded forms in a narrow area are evenly distributed over the entire area of the document so that visual noises and ghosts are distributed. Is reduced and improved image quality can be obtained.

Further, an adaptive modulation method other than the above is adopted.

In the adaptive modulation method, in order to reduce noise on the transmission channel, a low level video signal is amplified to the maximum allowable transmission level on the transmitting side, and the adaptive constant (amplification coefficient) is separately transmitted to the receiving side digitally. Then, the video signal received from the receiving side is divided into the adaptive constants. As a result, the noises of the adjacent channels that are restored to the level of the original signal are also divided at the same time, so that the divided numbers have the effect of reducing the noises of the channels.

[0009]

2. Description of the Related Art An encoding system based on the method proposed by MIT as described above is constructed as shown in FIG.

A high-quality video signal generated by the high rate generator 1 in the configuration of FIG. 1 is digitally converted by an A / D converter 2 and input to a quadrature mirror filter (hereinafter referred to as "QMF") bank 3. To be done. The QMF
The bank 3 transmits each corresponding sub block to the multiplexer 4 as shown in FIGS. 2 to 4 according to the operation detection mode of the input signal in the 45 sub blocks. Audio data D _A and transmission data D _D are applied to the multiplexer 4. Here, the transmission data D _D is a facsimile,
Data input from telex, telephone, etc. The multiplexer 4 time-division-multiplexes the sub-block output from the QMF bank 3 with the audio data D _A and the transmission data D _D under the control of the control unit 6. At this time, the multiplexer 4 outputs and transmits nine sub-blocks.

That is, as shown in FIG. G. The three B subblocks and the three V1, H1, and T1 baseband subblocks as shown in B of FIG. 2 are always transmitting subblocks, and C of FIG. 3 to F of FIG.
As described above, three sub blocks are added and transmitted.

3C to 4F in FIG. 3C, three subblocks V2, VH, and H2 are added when the input video signal is a still image, and D in FIG. If it is a movie, three sub-blocks of T2, VT and HT are added,
E of FIG. 4 has three sub-blocks of T2, T3 and T4 added when it is a moving image, and F of FIG. 4 has three sub-blocks of VH, VT and HT added when a video signal such as a movie is input. Indicates that it will be done. Further, in C of FIG. 3 to F of FIG. 4, the unit of the vertical axis fv is the number of lines per height of the unit screen (hereinafter referred to as “LPH”), and the unit of the horizontal axis f is the unit screen. The number of samples per width (hereinafter referred to as "SPW"), and the unit of the time axis f is the number of frames per second (hereinafter referred to as "FPS").

Next, after scrambling the time-division-multiplexed data in the storage unit 5 under the control of the control unit 6, the scrambled data is transmitted to a 6 MHz transmission channel. The output modulator 100 performs DSB-QM on a transmission format such as B of FIG. At this time, the scrambled data output from the storage unit 5 to the output modulator 100 becomes I channel data as shown in A of FIG. 5 and Q channel data as shown in B of FIG.

Then, in the above-mentioned FIG. 5A-5B, L1
Is two lines for transmitting the vertical synchronizing signal, and L2
Is a line for transmitting a video signal, and L3 is a line for transmitting audio data D _A and transmission data D _D.
There are 5 lines. The output modulator 100 inputs the I channel data in the scrambled data of the storage 5 to the first D / A converter 50 and the Q channel data to the second D / A converter 52 to convert them into analog signals. After that, 3MHz at the first and second LPFs 54 and 56, respectively
Low pass filtered. The low-pass filtered I channel signal is mixed and modulated by the carrier Cin and the mixer 58, and the Q channel signal is mixed by the mixer 60 with a signal obtained by phase-shifting the carrier Cin by 90 ° by the 90 ° phase shifter 60. Is modulated.

The modulated I channel signal and Q channel signal are added by an adder 64 and output as a high frequency (radio frequency) signal Sout. Here, the storage unit 5
Can output 8.4 M byte / Sec or 12 M byte / Sec data Dout for optical transmission, and can output the signal S'out for FM satellite communication or the like through the third D / A conversion unit 7 and the third LPF 8. Can also be output. The third LPF 8 low pass filters at 6 MHz.

The DSB-QM has a system in which a transmission signal is divided into two channels, an I channel and a Q channel, which have a phase difference of 90 ° and is transmitted.
Can be doubled. At this time, in order to reduce the interference with the adjacent channel, an algorithm for suppressing the high frequency carrier and removing the DC component is used.

On the other hand, in the method proposed by MIT, the three-dimensional sub-band division is divided into 45 sub-blocks with horizontal H: vertical V: time T of 3: 3: 5 as described above. At this time, the horizontal H: vertical V: 8 with respect to time T:
It can be divided as 8: 3. In the processing for the DC component, the low-luminance component is processed into 2 bits for the four basic sub-blocks, and the chromaticity components RY and B are processed.
-Y allocates 1 bit each and processes. In signal transmission, an analog signal and a digital signal are entirely superimposed and transmitted to a data under channel. For adaptive modulation, an adaptive constant and adaptively modulated video information are processed by data under.

As described above, the method proposed by MIT proposes basic ideas for various technologies, but is not well-established for detailed technologies and is not embodied for hardware. Not not.

[0019]

Therefore, the object of the present invention is to comply with the theory and idea of the system proposed by MIT in the simultaneous broadcasting system HDTV encoding system and system, and to obtain a further improved image quality. HDTV band compression using three-dimensional sub-band coding, adaptive modulation for channel noise and ghost suppression, scrambling, DSB-QM for improving transmission channel efficiency, and data under technology. It is an object of the present invention to provide an encoding system and a method thereof capable of encoding a high-quality video signal and a high-quality audio signal by using, and transmitting the encoded signals to a VHF channel or a UHF channel.

Another object of the present invention is to divide a baseband video signal into three-dimensional subbands of 8: 8: 4 with respect to horizontal axis: vertical axis: time axis, and band-compress as subband coding. An object of the present invention is to provide an encoding system and a method thereof capable of reproducing fine moving information by transmitting individual sub blocks and improving resolution.

It is another object of the present invention that, in sub-band coding, the DC low density area and the RY and BY chromaticity components are 8 bits for each of four basic sub-blocks. It is an object of the present invention to provide an encoding system and a method thereof which can improve the chromaticity reproducibility and increase the natural feeling of the document by processing the remaining luminance high frequency component to 1 bit.

Still another object of the present invention is to classify a signal transmission channel into an analog dedicated channel, a digital dedicated channel and a data under channel, and select and transmit the corresponding channel to obtain a CNR (channel to noise ratio) of 25 dB. An object of the present invention is also to provide an encoding system and a method thereof that can guarantee the basic image quality of the luminance low-frequency component and the chromaticity component.

Still another object of the present invention is to propose channel noise in the MIT by transmitting 12 basic sub-blocks to an analog-only channel and the remaining 22 sub-band blocks to a data-under channel. An object of the present invention is to provide an encoding system and a method thereof that can be improved relative to the method.

It is another object of the present invention to provide an encoding system and a system thereof capable of suppressing a low frequency noise component introduced during transmission by correcting transmission gamma after applying modulation.

[0025]

In order to achieve the above-mentioned object of the present invention, a base band video signal of a high definition television is band-compressed into three-dimensional sub-band coding, and divided sub-blocks are divided. By adaptively selecting and adaptively modulating, and then performing transmission gamma processing, data under processing, scrambling, and then performing output modulation as DCB-QM, it is possible to obtain an improved image quality compared to the method proposed by MIT. .

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 6 is a block diagram of an encoding block according to the present invention, which includes an HD camera section 12 for photographing a subject and outputting a digital HD video signal, and the HD.
A dynamic adaptive scan conversion unit 14 that performs dynamic adaptive scan conversion of a video signal and outputs the baseband video signal to a source and display format, and the baseband video signal is 8: 8 with respect to horizontal axis: vertical axis: time axis. : Divided into 4 and made into 256 sub-blocks, the luminance low-frequency component and the chromaticity component constitute the first sub-block in 12 sub-blocks and are transmitted to the analog dedicated channel. According to the adaptive selection, the three-dimensional QMF bank and adaptive selection unit 16 adaptively select 22 second sub-blocks of the 256 sub-blocks and transmit them to the data under channel together with the digital position information. The low frequency region in which the DC component per transmission frame is dense is extracted, converted into digital data, and converted to digital-only channels. YIQ DC data transmission unit 18 for transmitting the remaining luminance high frequency component to the data under channel, and the position information for the 22nd second sub-blocks by the adaptive selection is converted into digital data for the data under channel. To the filter selection data transmitting unit 20 for transmitting to the three-dimensional QMF bank and the adaptive selecting unit 16 and the 12 first sub-blocks and 22 adaptively selected second sub-blocks. An adaptive modulation unit 22 that amplifies a low signal to a maximum allowable transmission level of a reference value and performs adaptive modulation, and calculates an adaptive constant of the first block for the luminance low frequency component and chromaticity component by the adaptive modulation. A second block for the adaptive constant transmission unit 24 of the first block for transmitting to the digital dedicated channel and a second component for the luminance high frequency component by the adaptive modulation. Second to be transmitted to the data under the channel to calculate the lock adaption factor
Block adaptive constant transmission unit 26 and the adaptive modulation unit 2
2. A transmission gamma processing unit 28 that performs a transmission gamma process that performs non-linear processing to enhance a low-level signal of the transmission signal that is adaptively modulated in 2, and an audio signal processing unit 30 that encodes an audio signal by the MUSE method.
A transmission rate conversion unit 32 for converting a transmission rate for multiplexing the encoded audio signal with the gamma-processed video signal, and position information for the second sub-block of the filter selection data transmission unit 20. The adaptive constant of the second block of the second block, the adaptive constant of the second block, the transmission gamma-processed video signal and the transmission-rate-converted audio signal are input, the analog signal is reduced, and the upper two bits are data bits. A data under processing unit 34 for transmitting to a data under channel in which an analog signal component and a digital signal component are superposed, and the YIQ DC data transmission unit 18 and the adaptive constant transmission unit 24 of the first block. An analog-only channel of the data under processing unit 34, a data under channel First multiplexer 36 which multiplexes each data transmitted to the predetermined transmission format into a predetermined transmission format.
A PRN data generator 38 for generating pseudo random number (hereinafter referred to as “PRN”) data for scrambling in the time axis direction, a PRN row address and a PRN column address for scrambling in the spatial domain. It has a PRN address generator 40 which is generated in each other order per transmission frame by the PRN data, and a predetermined storage area, which stores the multiplexed data and outputs it by the PRN row address and the PRN column address. Scrambler 42 for scrambling
The horizontal sync signal HD, the vertical sync signal VD, and the channel deterioration correction signal ViTS are input from the scrambled signal and PRN data and a predetermined signal generating circuit, and the even-numbered line signal of the scrambled signal is input. And the horizontal synchronization signal HD, the vertical synchronization signal VD, and the signal ViTS for channel deterioration correction are multiplexed into an I channel transmission format, and received in the section of the horizontal synchronization signal HD, the vertical synchronization signal VD, and the signal ViTS for channel deterioration correction. "0" to facilitate clock recovery on the side
A second multiplexer 44 for inserting (zero) "data and multiplexing with the odd line signal of the scrambled signal into a Q channel transmission format.
And a first channel equalization filter 46 for channel equalization filtering the data of the I channel transmission format.
And a second channel equalization filter 48 for channel equalization filtering the data of the Q channel transmission format.
And a carrier wave Cin of the I-channel data and the Q-channel data, which have been subjected to the channel equalization filtering, to obtain a DSB-QM.
Output modulator 100 that outputs a high-frequency signal Sout as
Composed of and.

The horizontal synchronizing signal HD and the vertical synchronizing signal VD generated by the predetermined signal generating circuit in the configuration of FIG. 6 and input to the second multiplexer 44 are the horizontal synchronizing signal and the vertical synchronizing signal of the respective transmission video signal data. The signal ViTS for correcting the deterioration characteristic of the channel is signal data for correcting the deterioration characteristic of the transmission channel.

The output modulator 100 has the same structure as that of the output modulator 100 of FIG. 1, and the reference numerals are also the same.
The carrier Cin input to the output modulator 100 is the same color subcarrier as the carrier Cin input to the output modulator 100 of FIG.

On the other hand, the first sub-block transmitted to the analog dedicated channel in the three-dimensional QMF bank and the adaptive selector 16 is always transmitted to the input image without correlation 1.
The second basic sub-block means two basic sub-blocks, and the second basic sub-block transmitted to the data under channel means 22 sub-blocks adaptively selected and transmitted according to the operation information of the input image.

The adaptive constant of the first block is the first
It means the adaptive modulation constant for the sub-block during adaptive modulation, and the adaptive constant of the second block means the constant for the adaptive modulation during adaptive modulation for the second sub-block.

FIG. 7 is a diagram showing the source and display format of FIG. 6, which is a source and display format for conforming the HD-MUSE signal standard to the MIT system, and the output of the dynamic adaptive scan conversion unit 14. The morphology is shown.

FIG. 8 is a DSP (digital signal processing) format diagram according to FIG. 7, wherein the source and display spectrum SPEC 'of FIG. 7 is set to 8: 8: 4 with respect to the horizontal axis: vertical axis: time axis. A DSP format for video data processing that facilitates clock conversion by three-dimensional sub-band division.
It is an input data format of the F bank and the adaptive selection unit 16.

FIG. 9 is a data transmission format diagram of FIG. 6, in which the video data divided into sub-bands, various data and audio are converted to existing MHz by DSB-QM.
It is a data transmission format for transmitting to a contraindicated channel.

FIGS. 10A-10B are I-channel and Q-channel transmission format diagrams according to FIG. 9, and FIG. 10A is for transmitting video data, various data and audio data on the I-channel. In the second multiplexer 44, 255 lines of digital dedicated channels and 270 lines of analog dedicated channels are used.
It indicates that data is allocated to the data under channel of 5 lines and transmitted. 10B shows the division of the transmission channel on the Q channel corresponding to the I channel transmission format of FIG. 10A. The B of FIG. 10 is the A of FIG.
Is different from the horizontal synchronization signal HD and the vertical synchronization signal VD on the receiving side and the signal ViTS for correcting the channel deterioration characteristic.
10 is inserted on the I channel of FIG. 10 while it is not inserted on the Q channel of B of FIG. 10, instead "zero (zero)" data is inserted. This is for matching the clock phases of the receiving side and the receiving side, and is for reproducing the clock on the receiving side.

FIG. 11 shows the distribution of the input video signal of the base band shown in FIG. 6 in a three-dimensional manner.

FIG. 12 is a block diagram of a three-dimensional sub-block of the baseband input video signal of FIG. 11, wherein the baseband input video signal of FIG. 11 is a three-dimensional QM.
It is shown that the F bank and the adaptive selection unit 16 divide the horizontal axis: vertical axis: time axis into 8: 8: 4 to form 256 subbands.

FIG. 13 is a view showing an example of the view space area of the unit sub-block shown in FIG. 12, in which the original image is divided equally into 256 sub-bands as shown in FIG. A view space area is shown.

FIG. 14 is an illustration of the resolution limit of FIG. 6 and shows the resolution limit of the frequency or DC component having a low luminance component and the chromaticity components RY and BY. That is, as shown in FIG. 12, when the sub-band is divided into 256 sub-bands, the fundamental band of the low frequency component in the visual space is shown, which is 4 sub-blocks. The signal component is a basic transmission block that is always transmitted without correlation with the type of video image.

FIG. 15 is an exemplary view of the DC component extraction area of FIG. 6, which corresponds to a shaded area per frame on the transmission side in order to reproduce the brightness of the luminance and chromaticity components on the reception side. DC in the low frequency region where the DC component
The extraction area of the DC component for extracting the component by the YIQ DC data transmission unit 18 and transmitting the value digitally is shown. FIG. 16 is a view showing an example of a unit area for adaptive selection of the moving image of FIG. 6, showing a unit of position information of a corresponding transmission block for adaptive selection in the three-dimensional QMF bank and adaptive selection unit 16. It shows the area and is 8 horizontal x vertical.
Horizontal axis 128 of the original image input as an area of × 8 unit
It shows that 0 sample is divided into 160 equal parts and the vertical axis 720 line is divided into 90 equal parts and transmitted.

FIG. 17 is a view showing an example of a unit area for adaptive modulation shown in FIG. 6, which is input when the unit area for adaptive modulation in the adaptive modulator 22 is 5 × 5 (horizontal × vertical). It is shown that 1280 samples on the horizontal axis of the original image are divided into 32 equal parts and 720 lines on the vertical axis are divided into 18 equal parts to be divided into 576 regions.

18A-18B is an analog and digital bit allocation diagram in the data under processing unit 34 of FIG. 6, and FIG. 18A shows that the video analog sample value in the analog channel is 8 bits. The bit allocation in the case of doing is shown. Where the least significant bit LS
B is represented as 0 and the most significant bit MSB is represented as 7.
18B shows MSB of 7 when the analog sample value of A of FIG. 18 is reduced to 1/4.
Are moved to the right by 2 bits and the least significant bits of 1s and 0s are removed.

Then, 0 is inserted as a pseudo (dummy) bit in the lower bit next to the most significant bit MSB, and digital data is allocated to the most significant bit MSB for the first time.
Therefore, the analog sample value is the most significant bit M on the receiving side.
It is possible to restore the level of the original signal by shifting twice to SB, and not only digital data but also
Since the most significant bit MSB can be taken, it can be restored on the receiving side.

Therefore, the analog signal and the digital data can be transmitted and received as one channel, which is called a data under channel.

19A to 19C are form diagrams of the data transmission of the transmission channel of FIG.
Shows the form at the time of data transmission to the digital transmission channel, B of FIG. 19 shows the form at the time of data transmission to the analog dedicated channel, and C of FIG. 19 shows the form at the time of data transmission to the data under channel. The transmission data form in the case of the data under channel as shown in C of FIG. 19 is expressed as analog by comparing with the digital dedicated channel of A of FIG. 19 and the analog dedicated channel of B of FIG. It was done.

20A to 20B are the transmission gamma processing diagrams of FIG. 6, and FIG. 20A shows the transmission gamma processing unit 28 in which the low level signal of the adaptively modulated transmission signal is nonlinear. It indicates that the transmission gamma processing is performed by increasing the processing. 20B shows that the signal transmitted by the transmission gamma process is restored to the original signal level by the non-linear processing symmetrical to that of FIG.

Hereinafter, the operation example of FIG. 6 according to the present invention will be described in detail with reference to FIGS. 7 to 20B.

Now, when the power is turned on and the HD camera section 12 of FIG. 6 images a subject and outputs a digital HD video signal to the dynamic adaptive scan conversion section 14, the dynamic adaptive scan conversion section 14 causes the HD video to move. The signal is subjected to dynamic adaptive scan conversion to output a baseband video signal in a source and display format as shown in FIG. At this time, the three-dimensional distribution of the baseband video signal as shown in FIG. 7 is as shown in FIG.

Three-dimensional QMF bank and adaptive selector 1
6 inputs the baseband video signal as shown in FIG. 11 to the DSP format as shown in FIG. 8 and the horizontal axis: vertical axis:
Each of them is divided into 8: 8: 4 with respect to the time axis to form 256 sub blocks as shown in FIG. At this time, the view space area of the divided unit sub-block is as shown in FIG.

Next, according to the motion information of the input image, 256
Twenty-two sub-blocks are adaptively selected as the second sub-block according to the order in which the video energy in each sub-block is distributed. The luminance low-frequency component and the chromaticity component are 12 basic sub-blocks, that is, four luminance low-frequency components having the limitation of the image degree as shown in FIG. 14, chromaticity component R-Y4, and chromaticity component B-Y4. A first sub-block is formed of the sub-blocks and is transmitted together with the second sub-block. Here, the transmission channel and the transmission data amount of the first and second sub-blocks are as shown in [Table 1] below, which indicates each transmission information and transmission data amount on the transmission channel.

[0051]

[Table 1]

In Table 1 above, ECC means an error correction code.

When the adaptive selection is performed, the horizontal axis 1280 of the original image is set as a unit area of 8 × 8 (horizontal × vertical) as shown in FIG.
The sample is divided into 160 equal parts and the vertical axis 720 lines are divided into 90 equal parts for transmission.

By the adaptive selection, the YIQ DC data transmission unit 18 extracts a low frequency region (horizontal 80 samples in the shaded portion, vertical 45 lines) in which DC components are dense as shown in FIG. 15, and Y, I (or RY), Q (or B)
-Y) are all digitally converted to 8 bits and transmitted to the digital transmission channel as shown in [Table 1] above, and 1 bit is applied to the remaining luminance high frequency component (the remaining portion other than the shaded area). Allocate and transmit to the data under channel as shown in [Table 1] above. As a result, interference between channels can be reduced by greatly reducing the level of the modulation signal.

Further, by the adaptive selection, the filter selection data transmission unit 20 converts the position information for the 22 second sub-blocks into digital data and transmits it to the data under channel as shown in Table 1 above. As a result, the basic image quality can be guaranteed when the CNR is lower than 25 dB.

Through adaptive selection as described above, the whole 256
Since only 34 sub-blocks of the sub-blocks are transmitted, an effect of band compression of about 1/8 occurs. By transmitting the first sub-block to the analog-only channel as shown in [Table 1] above, the influence of channel noise can be reduced as compared with the case of using the data under channel.

As shown in FIG. 17, the adaptive modulator 22 responds to the 12 first sub-blocks and 22 adaptively selected second sub-blocks output from the three-dimensional QMF bank and adaptive selector 16. Adaptive modulation is performed by dividing the original video image into 32 horizons horizontally and 18 horizons vertically divided into 18 equal areas, each of which is a unit area of 5 × 5 horizontal × vertical. The adaptive modulator 22 amplifies a signal having a low amplitude with respect to the 34 sub-blocks to a maximum allowable transmission level of a reference value, and separately transmits an adaptive constant, which is an amplification factor, to digital data.

Then, when noise of the transmission channel is introduced into the amplified low-amplitude signal, the receiving level is divided into the adaptive constants in order to reproduce the original signal on the receiving side. Since noise is reduced as well as amplification count, noise is reduced.

The luminance low frequency component and the chromaticity component at the time of the adaptive modulation are regarded as basic sub-blocks by the adaptive constant transmission unit 24 of the first block, and the first block is assigned to the digital dedicated channel as shown in Table 1 above. Of the second block is transmitted to the data under-channel as shown in [Table 1].

The adaptively modulated signal is subjected to transmission gamma processing by the transmission gamma processing unit 28 as shown in A of FIG. In the transmission gamma processing, a noise component is clearly visible in a dark portion, but is not visible in a bright portion. The signal is restored to the level of the original signal by performing a linear process to greatly enhance the signal and performing signal processing so as to have an inverse characteristic symmetrical to that at the time of transmission as shown in FIG. 20B at the time of reception. is there. As a result, although the original signal level at the time of reception is reproduced without distortion, the noise component introduced at the time of channel transmission is suppressed more toward the non-linear portion, so that it has a result of noise reduction.

The signal subjected to the transmission gamma processing is input to the data under processing unit 34. At the same time, a signal encoded by the MUSE method in the audio signal processing unit 30 and converted in transmission rate by the transmission rate conversion unit 32 is input to the data under processing unit 34. Then, the data under processing unit 34 performs the transmission gamma processing on the position information for the second sub-block of the data transmission unit 20 of the filter selection and the adaptive constant of the second block of the transmission constant 26 of the adaptive constant of the second block. The signal and the signal whose transmission rate has been converted are input, the analog signal is reduced as shown in B of FIG. 18, the data bit is inserted into the upper 2 bits, and the signal is transmitted. As a result, the digital dedicated channel, the analog dedicated channel, and the data under channel shown in FIGS. 19A to 19C are added to the above [Table 1].
It becomes possible to transmit data such as
It is possible to obtain a double compression effect of the transmission band. Further, the first multiplexer 36 includes the YIQ DC data transmission unit 18, the adaptive constant transmission unit 24 of the first block, and the data under processing unit 34, which are channels dedicated to analog and digital, as shown in Table 1 above. Each data transmitted in the data under channel is multiplexed into the transmission format as shown in FIG.

The data multiplexed by the first multiplexer 36 is scrambled by the scrambler 42 so that the channel noise is evenly distributed over the entire area of the screen to obtain the effect of visually reducing the noise. be able to. At this time, the PRN data generator 3
8 PRN for time side scrambling
A PRN row address and a PRN for generating data and scribing a spatial area according to the PRN data.
The column address is generated by the PRN address generator 40.
The scrambler 40 stores the multiplexed data in a predetermined storage area and then outputs the multiplexed data according to the PRN row address and the PRN column address to perform scrambling. The PRN data generating unit 38 generates PRN addresses in different directions in the time axis direction, that is, per frame, and the PRN data is received at the receiving side by the PRN data.
It plays the role of restoring the order of RN addresses so that the original signal can be reproduced. Then, the PRN address generating unit 40 performs scrambling in the spatial domain, and the PRN data generating unit 38 performs scrambling in the time axis direction to perform three-dimensional scrambling. As a result, it has a perfect scrambling effect and a secretarial function, so that it can be used for military purposes, and can also be used commercially for pay TV.

The scrambled signal and P
The RN data is sent by the second multiplexer 44 to the horizontal synchronizing signal H.
D, vertical sync signal VD, and signal V for channel deterioration correction
It is time-division multiplexed with the iTS into the I-channel and Q-channel transmission formats as shown in FIGS. 10A-10B. This is because the output modulator 100 performs DSB-QM on the transmission format as shown in FIG.
This is for channel multiplexing as indicated by B in FIG. At this time, the PRN data output through the scrambler 42 is multiplexed with separate digital data to obtain a scrambling effect even in a still picture.

The second multiplexer 44 stores the data of the I channel transmission format in which the even line signals are multiplexed as shown in A of FIG. 10 and the data of FIG.
Q in which odd-numbered line signals are multiplexed like B of 0
The data of the channel transmission format is set to the first and the second, respectively.
It outputs to the channel equalization filters 46 and 48. At this time, the second multiplexer 44 allocates the video data, various data and audio data to the 255-line digital transmission channel, the 270-line analog dedicated channel and the 505-line data under-channel, respectively, as shown in Table 1 above. Then, the vertical synchronizing signal VD and the signal ViTS for correcting the channel deterioration characteristic are assigned to two lines.

Therefore, the data of the I-channel and Q-channel transmission formats are equalized and filtered by the first and second channel equalization filters, respectively, and then the output modulator 100 outputs DSB-Q as carrier Cin.
It is M and output as a high frequency signal Sout. The operation of the output modulator 100 is as described above with reference to FIG. The output high frequency signal Sout is transmitted by using the contraindicated channels of the current NTSC VHF and UHF channels.

On the other hand, according to the present invention, high-quality and high-sound HD
Not only TV, but also secretary function by scrambling, so secret TV conference and information transmission for military use, TV application products such as tape TV for commercial use, and high quality digital video tape using band compression coding technology, Recorder, wide band integrated communication network (BI) of 64 kbps line
Video code for SDN
c), telecine and kineco for compatibility with 35mm motion picture film,
It can be used for electronic printing and publishing machines.

[0067]

As described above, the present invention is an H-type broadcasting
In accordance with the theory and idea of the DTV encoding system and the system proposed by MIT in the system, HDTV band compression using three-dimensional subband cordless, adaptive modulation for suppressing channel noise and ghost, and transmission gamma. DSB-Q for processing, scrambling and increasing the efficiency of the transmission channel
M and the encoding system that encodes a high-quality video signal and a high-quality audio signal by using the data under technology and the advantage that an improved image quality can be obtained as compared with the method proposed by MIT. is there.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an encoding system of a system proposed by a conventional MIT.

FIG. 2 is an exemplary diagram of a transmission mode in a frequency domain of FIG.

3 is an exemplary diagram of a transmission mode in the frequency domain of FIG. 1. FIG.

4 is an exemplary diagram of transmission modes in the frequency domain of FIG. 1. FIG.

5 is a transmission format diagram of FIG.

FIG. 6 is a block diagram of an encoding system according to the present invention.

7 is a source and display format diagram of FIG. 6 according to the present invention.

8 is a DSP format diagram according to FIG. 7. FIG.

9 is a data transmission format diagram of FIG.

10 is a transmission format diagram of I channel and Q channel according to FIG. 9;

11 is a three-dimensional distribution diagram of the baseband input video signal of FIG. 6;

FIG. 12 is a configuration diagram of a three-dimensional sub-block.

13 is an exemplary diagram of a view space area of the unit sub-block of FIG.

FIG. 14 is a diagram illustrating a limit of resolution of FIG. 6;

15 is an exemplary diagram of a DC component extraction region of FIG. 6;

16 is an exemplary diagram of a unit area for moving image adaptive selection in FIG. 6;

17 is an exemplary diagram of a unit area for adaptive modulation of FIG. 6;

FIG. 18 is an analog and digital bit allocation diagram of FIG. 6;

19 is a form diagram of data transmission of the transmission channel of FIG. 6;

20 is a transmission gamma processing diagram of FIG. 6;

[Explanation of symbols]

 12 HD camera unit 14 Dynamic adaptive scan conversion unit 16 Three-dimensional QMF bank and adaptive selection unit 18 YIQ DC data transmission unit 20 Filter selection data transmission unit 22 Adaptive modulation unit 24 Adaptive constant transmission unit of the first block 26 Second block Adaptive constant transmission unit 28 Transmission gamma processing unit 30 Audio processing unit 32 Transmission rate conversion unit 34 Data under processing unit 36,44 First and second multiplexer 38 PRN data generation unit 40 PRN address generation unit 42 Scrambler 46,48 1st, 2nd channel equalization filter 50, 52 1st, 2nd D / A converter 54, 56 1st, 2nd LPF 58, 62 mixer 60 90 ° phase shifter 64 adder 100 output modulator

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04N 11/24

Claims (7)

[Claims] 1. A high-definition television encoding system for simultaneous broadcasting, wherein a high-definition television video signal is subjected to dynamic adaptive scan conversion to output a baseband video signal to a source and display format ( 14) and the baseband video signal is divided into 256 sub-blocks by dividing each of the horizontal axis: vertical axis: time axis into 8: 8: 4, and 12 low luminance components and 12 chromaticity components are provided. The first sub-block is composed of the sub-block and the second sub-block and is transmitted to the analog dedicated channel.
A three-dimensional quadrature mirror filter bank and adaptive selection unit (16) for adaptively selecting 22 second sub-blocks out of 56 sub-blocks and transmitting to the data under-channel together with digital position information; A low frequency region in which DC components per transmission frame are densely extracted by adaptive selection is extracted, converted into digital data and transmitted to a digital dedicated channel, and the remaining high luminance component is transmitted to a data under channel YIQ
A DC data transmission unit (18) and a filter selection data transmission unit (2) for converting the position information for the 22nd second sub-blocks by the adaptive selection into digital data and transmitting it to a data under channel.
0), and a signal having a low amplitude with respect to the 12 first sub-blocks and 22 adaptively selected second sub-blocks output from the three-dimensional QMF bank and adaptive selection unit (16) as reference values. An adaptive modulation section (22) that amplifies and adaptively modulates to the maximum permissible transmission level of, and an adaptive constant of the first block is calculated for the luminance low frequency component and chromaticity component by the adaptive modulation, and the digital constant channel The adaptive constant transmission unit of the first block to be transmitted (2
4), an adaptive constant transmission unit (26) for the second block that calculates the adaptive constant of the second block for the high-luminance component by the adaptive modulation, and transmits the adaptive constant to the data under channel; and the adaptive modulation unit (22). ), A transmission gamma processing unit (28) that performs a transmission gamma process that nonlinearly processes and enhances a low-level signal of the transmission signal that has been adaptively modulated by (4), and an audio signal processing unit (30) that encodes an audio signal by the MUSE method. ), A transmission rate conversion unit (32) for converting a transmission rate to multiplex the encoded audio signal with the gamma-processed video signal, and a second sub-unit of the filter selection data transmission unit (20). Position information for the block, the adaptive constant of the second block of the adaptive constant transmitting unit (26) of the second block, and the transmission gamma processing. The processed video signal and the audio signal whose transmission rate has been converted are input, the analog signal is reduced, data bits are inserted in the upper bits, and the data under channel is a form in which the analog signal component and the digital signal component are superimposed. A data under processing unit (34) for transmitting, the YIQ DC data transmission unit (18), an adaptive constant transmission unit (24) for the first block, and a data under processing unit (3)
4) A first multiplexer (36) that multiplexes each data transmitted to the analog dedicated channel and the data under channel into a predetermined transmission format, and pseudo random number data for scrambling in the time axis direction is generated. A pseudo-random number data generator (38), which generates pseudo-random number row addresses and pseudo-random number column addresses for scrambling in a spatial area in different order per transmission frame by the pseudo-random number data. Random number address generator (4
0), and a scrambler (42) for storing the multiplexed data, outputting the scrambled data by the pseudo random number row address and the pseudo random number column address, and scrambling. The horizontal sync signal, the vertical sync signal, and the signal for correcting the channel deterioration from the predetermined signal generation circuit and the pseudo random number data, and the even-numbered line signal of the scrambled signal and the horizontal sync signal. A signal, a vertical sync signal, and a channel deterioration correction number are multiplexed in an I-channel transmission format to facilitate clock recovery on the receiving side in the horizontal sync signal, vertical sync signal, and channel deterioration correction signal section. Odd number of the scrambled signal by inserting 0 (zero) data. Second multiplexer for multiplexing the Q channel transmission format along with the line signal (44) and said I first channel equalization filter (46) for channel equalization filtering data channel transmission format
And a second channel equalization filter (48) for channel equalization filtering the data of the Q channel transmission format.
And the channel equalized and filtered I channel data and Q
A simultaneous broadcasting high-definition television encoding system, comprising: an output modulator (100) that outputs a high-frequency signal by DSB-QM using channel data as a carrier. 2. The three-dimensional quadrature mirror field bank and adaptive selection unit (16) adaptively selects an area of horizontal × vertical 8 × 8 units for the 256 sub-blocks. An encoding system for a high-definition television of the simultaneous broadcasting system according to claim 1. 3. The adaptive modulation unit (22) according to claim 1, wherein the adaptive modulation unit (22) adaptively modulates each of the first and second sub-blocks into a region of horizontal × vertical 5 × 5 units. Encoding system for broadcasting high-definition television. 4. A high-definition television encoding system for simultaneous broadcasting, wherein a high-definition television baseband signal is divided into horizontal axis: vertical axis: time axis at 8: 8: 4, and 256 12 sub-blocks for the luminance low-frequency component and chromaticity component
The first sub-block is composed of these sub-blocks and transmitted to a channel dedicated to analog, and 22 sub-blocks of the 256 sub-blocks are adaptively selected as the second sub-block according to the operation information of the input image. The sub-block division and adaptive selection process of transmitting to the data under-channel together with the digital position information, and the low frequency region in which the DC component per transmission frame is dense due to the adaptive selection is extracted, converted into digital data and digitalized. YI is transmitted to a dedicated channel, and the remaining luminance high frequency component is transmitted to the data under channel.
Q DC data transmission step, filter selection data transmission step of converting position information for 22 second sub-blocks by the adaptive selection into digital data and transmitting to digital data under-channel, and 12 first sub-blocks. An adaptive modulation process of adaptively modulating 22 adaptively selected second sub-blocks, and an adaptive constant of the first block is calculated for the luminance low band component and the chromaticity component by the adaptive modulation, and the luminance high band is calculated. A block adaptive constant transmission process of calculating an adaptive constant of the second block for the component and transmitting it to the data under channel, and a low-level signal of the adaptively modulated transmission signal are subjected to nonlinear processing to enhance the signal. A transmission gamma processing step of performing transmission gamma processing, and encoding the audio signal according to the MUSE method, An audio signal conversion process for converting the analog signal of the position information for the second sub-block, the adaptive constant of the second block and the transmission gamma-processed video signal and audio signal, and inserting a data bit in the upper bit. Of the first block of the data under processing process of transmitting the analog signal component and the digital signal component to the data under channel in a superimposed form, the transmission data of the YIQ DC data process and the transmission process of the adaptive constant of the block. A scrambling step of multiplexing adaptive constants and transmission data of the data under processing step into a transmission format, and scrambling with pseudo random number data and pseudo random number row / column addresses based on the pseudo random number data; and the scrambling step. The school Random numbered data and pseudo random number data, horizontal sync signal, vertical sync signal, and signal for correcting channel deterioration are multiplexed into the I-channel transmission format for even line data and Q-channel transmission format for odd line data. Of a high-definition television of the simultaneous broadcasting system, which is characterized by a transmission format conversion step for performing the same and an output modulation step for subjecting the multiplexed I and Q channel data to channel equalization filtering and DSB-QM. Encoding method. 5. The method according to claim 4, wherein when the sub-block is divided and adaptively selected in an adaptive selection process, the 256 sub-blocks are adaptively selected into an area of horizontal × vertical 8 × 8 units. High-definition television encoding method of simultaneous broadcasting system. 6. The simultaneous modulation according to claim 4, wherein during the adaptive modulation in the adaptive modulation process, the adaptive modulation is performed on a region of horizontal × vertical 5 × 5 units with respect to the first and second sub-blocks. High-definition television encoding method for broadcasting. 7. The data of the Q channel transmission format in the process of converting the transmission format is "0" for facilitating clock recovery on the receiving side during the horizontal synchronizing signal, the vertical synchronizing signal, and a signal week for correcting channel deterioration. 5. The high-definition television encoding system according to claim 4, wherein the data is inserted and multiplexed with the odd-numbered line signal of the scrambled signal.